Privnote alternative: Coprinus
Coprinus is a Privnote alternative. It sends a note that disappears after a single read. The core is similar: encryption in the browser, the key in the link, one-time read. Coprinus also has voice notes and a time capsule. Privnote has years behind it and recognition. Feature comparison below.
At a glance
| Coprinus | Privnote | |
|---|---|---|
| Encryption in the browser | Yes | Yes |
| Key only in the link (after #) | Yes | Yes |
| Disappears after one read | Yes | Yes |
| Password (optional) | Yes | Yes |
| Self-destruct timer | Yes | Yes |
| Anti-bot screen (scanners won't burn the link) | Yes | Yes |
| Voice notes | Yes | No |
| Time capsule (a letter to the future) | Yes | No |
| Email read receipt | Yes | Yes |
| Hosting | EU (Frankfurt) | USA |
| Price | Free | Free + business plan |
What the server sees
Type a secret and see the only thing that ever reaches the server.
You write · on your side
↓ on the way to us it turns into ink
Our server sees
Here's what the server receives. Nothing yet, because you haven't written anything.
The note's content is noise. The key stays in your browser, never with us.
Security and privacy
Both tools encrypt the note in the browser and keep the key in the link, after the # sign, so the server only ever sees ciphertext. The key never reaches the server, and on read the note is removed in one operation. Coprinus data sits in the European Union, in the Frankfurt region.
Features
Both have a password, a self-destruct timer, a screen that protects the link from scanners and an email read receipt. Coprinus also adds voice notes (record instead of typing, encrypted in your browser too) and a time capsule, a note that unlocks on a future date you choose.
A note on fakes
With self-destructing note tools, make sure you are on the real domain. Copycats of such services circulate online, this applies to this tool and Privnote alike.
Coprinus fits if
- •You want to record a secret by voice instead of typing it.
- •You want to send a note that unlocks in the future (time capsule).
- •You prefer EU hosting (Frankfurt).
Privnote fits if
- •You want a recognizable tool with a long history.
- •Plain text is enough, without voice or scheduling.
Frequently asked
Is Coprinus a good Privnote alternative?
Yes. It has the same core (browser encryption, key in the link, one-time read) plus voice notes and a time capsule.
Can anyone read my note?
They should not. The content is encrypted in your browser, and the key stays in the link, after the # sign, and never reaches us. Without the key we only see noise.
Can I send a voice note?
Yes. Instead of typing, you can record a secret by voice. The audio is encrypted in your browser just like text and disappears after a single listen.
What is the time capsule?
It is a note that only unlocks on a future date you choose, like a letter to yourself. Until then it sits encrypted, and the key still lives only in the link.
Does the note really disappear?
Yes. The first open removes it from the server in one operation. There is no second read and no copy remains.
Where is the data stored?
In the European Union, in the Frankfurt region.
Is Coprinus free?
Yes, sending vanishing notes is free.